Effect of the antiallergic drug disodium cromoglycate and various derivatives on alkaline phosphatase

An efficient synthesis of carboxaldehyde derivatives of 4H-pyran-4-one

We developed a general method for the synthesis of various 2-mono- and 2,6-di-carboxaldehyde substituted derivatives of 3,5-diphenyl-4H-pyran-4-one and 4H-pyran-4-one. 3,5-Diphenyl-6-methyl-4-oxo-4H-pyran-2-carboxaldehyde (4a), 6-methyl-4-oxo-4H-pyran-2-carboxaldehyde (4b), 3,5-diphenyl-4-oxo-4H-pyran-2,6-dicarboxaldehyde (5a), 4-oxo-4H-pyran-2,6-dicarboxaldehyde (5b), 3,5-diphenyl-6-hydroxymethyl-4-oxo-4H-pyran-2-carboxaldehyde (10a), and 6-hydroxymethyl-4-oxo-4H-pyran-2-carboxaldehyde (10b) were obtained from the corresponding di-, tri-, and tetra-bromo derivatives of 2,6-dimethyl-3,5-diphenyl-4H-pyran-4-one (1a) and 2,6-dimethyl-4H-pyran-4-one (1b) by treatment with silver acetate followed by hydrolysis. Compounds 4a and 4b were also obtained by the oxidation of 10a and 10b with barium manganate.Key words: 4H-pyran-4-one, hydroxymethyl and carboxaldehyde derivatives, acetoxylation, hydrolysis, oxidation.

Central effects of cromoglycate sodium salt in rats treated with lipopolysaccharide

In 24-h water- and food-deprived rats, we have evaluated the effects of cromoglycate sodium salt, an inhibitor of the mast cell degranulation with anti-inflammatory and membrane-stabilizating activity, on the central effects induced by Escherichia coli lipopolysaccharide (LPS). Intraperitoneal (i.p.) injection of LPS (0.25, 0.50 and 1 mg/kg) induced a dose-dependent inhibition of water and food intake, fever, reduction in locomotor activity as well as increased anxiety levels. All these LPS effects were antagonized by a prior intracerebroventricular (i.c.v.) injection of cromoglycate sodium salt (100, 150 and 200 microg/rat). Our findings suggest that peripheral LPS administration may activate brain mast cells and indicate an involvement of these cells in brain pathophysiology.

Effect of the antiallergic drug disodium cromoglycate on phosphodiesterase activity

The antiallergic drug disodium cromoglycate and its non-antiallergic analogue dicoumarol, inhibit the enzymatic activity of phosphodiesterase with KI values of 0.8.10(-9) M and 1.6.10(-9) M, respectively. It seems that the dichromone group is responsible for this inhibition, independently of its antiallergic effect.